Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad68e21b96cd33a5…

MALICIOUS

PDF

73.6 KB Created: 2021-09-24 18:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50e6bcbf4605951d3ea033389f87bd7e SHA-1: 771386bd3a0f1b553501f35cf5a1f67b7c60a721 SHA-256: ad68e21b96cd33a501b0c88bdeacc188eda028bff91ae72bf806fc4de0099b57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=czy+na+tablet+z+androidem+mozna+wgrac+windowsa
    • https://taybaite.com/userfiles/file/76737937742.pdf
    • http://security-m.jp/tool/images/file/58076285690.pdf
    • http://istanbulballoons.com/ckfinder/userfiles/files/susopilususur.pdf
    • https://mimpishio2.com/contents/files/95517171843.pdf
    • http://biafrapol.pl/pliki/file/75917182096.pdf
    • https://snapstudios.ca/userfiles/file/94514967842.pdf
    • https://ijieet.org/ckfinder/userfiles/files/79172846212.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613370a6e2e3a---99643305515.pdf
    • http://steinbach.casawell.tw/userfiles/file/47408269246.pdf
    • http://trustarshida.co/cache/fck_files/file/xupalofimegamijomiduwof.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146877b1bab0---26962359432.pdf
    • http://jncs.kr/page_data/file/20210910012527.pdf
    • https://senarathgroup.lk/assets/media/file/gipogipepe.pdf
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/zamudeguxudigo.pdf
    • http://mertcelikkapi.com/userfiles/file/81495809584.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614923c811af6---rojenuliv.pdf
    • http://vuonlan.vn/data/upload/files/kixoso.pdf
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/21152000732.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614586395adc1---rigojemofenerajij.pdf
    • https://alpasol.e-giant.net/upload/files/8866412035.pdf
    • http://szyqjsj.com/UploadFile/file/20210923194851048.pdf
    • http://kingkady.com/uploadfile/files/sajewumazomenefojutu.pdf
    • http://saddabro.com/userfiles/file/xapivalufiguluxonipamijim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b869.bin
2e42c51514938c5527f7691d6c2de6291522f27bd89ca0b50235dc26ab21ff8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB869 11144 bytes
font_01_sfnt_off0000d25d.bin
7cbcb4a908e7dbc2e537a7aef341584e6996842e473954db21f05d4a3c097d61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD25D 17732 bytes
font_02_sfnt_off0001006e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 16792 bytes

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